Jeweler s work-bench



(No Model.)

M. H. KNAPP.

JEWELERS WORK BENCH. 1

No. 260,880. Patented July 11, 1882..

N. PETERS. PhOlWl-"hvgmphul. Washington. D. c.

UNITED STATES PATENT OFFICE.

MILTON H. KNAPP, OF ADRIAN, MICHIGAN.

JEWELERS WORK-BENCH.

SPECIFICATION forming part of Letters Patent No. 260,880, dated July 11,1882. Application filed May 14, 1881. Renewed'd'anuary 14, 1882. (Nomodel.)

To all whom it may concern:

Be it known that I, MILTON H. KNAPP, of Adrian, Lenawee county,Michigan, have invented an Improvement in Dentists or J ewelersBenches,of which the following is a specification.

The nature of this invention relates to certain new and usefuliinprovementsin theconstruction of work-benches especially designedBeneath the top of the bench is a frame, F,

and in this frame is secured the bellows G, preferably of the formshown. One end of a cord or belt, I ,is secured to thelower bellows,which passes thence up and over a pulley, a, and down to the crank-armE, to which its opposite end is secured.

A spring, J, is secured at one end to the lower bellows, its oppositeend being secured to the frame of the bench or to the floor, asdescribed.

A similar spring, K, is connected at one end to the upper bellows, whileits opposite end is secured to the frame F or any other suitable portionof the bench.

By this construction and arrangement of parts I provide a means foroperatingalathe, L, upon the top of the bench, if desired, by a beltfrom the pulley D; but when thus used the belt I should lie-detachedfrom the crankarm E.

When it is desired to use the bellowsin connection with a blow-pipe,with which it may readily be connected by any proper means, the belt Iis attached to the crank-arm E, when by rotating theshaft by means ofthe treadle G the belt I is caused to draw up the lower bellows, whichforces its air into the upper bellows, the spring J drawing the lowerbellows down, and so on, alternatelyinflating and expelling air into theupper bellows, whence itis forced in a continuous steady blast by theaction of the spring K, while the pulley Dserves as a balance-wheel andinsures steadiness in the action of the lower bellows.

What I claim as my invention is- A work-bench, A, provided with acrankshaft, B, operated by a treadle, C, in combination with the bellowsGr, crank-arm E, frame F, pulley a, belt I, springs J K, and pulley D,substantially as set forth.

MILTON H. KNAPP.

Witnesses:

R. B. RoBBINs, J. O. WINNIE.

